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    <title>Document</title>
    <script>
        function tranList(arr){
            const arr =  [
            { 'id': '29', 'pid': '', 'name': '总裁办' },
            { 'id': '2c', 'pid': '', 'name': '财务部' },
            { 'id': '2d', 'pid': '2c', 'name': '财务核算部' },
            { 'id': '2f', 'pid': '2c', 'name': '薪资管理部' },
            { 'id': 'd2', 'pid': '', 'name': '技术部' },
            { 'id': 'd3', 'pid': 'd2', 'name': 'Java研发部' }
         ]
       const map = []
       arr.forEach(item=>{
        item.children=[]
        map[item.id]=item
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       console.log(map);
       const newarr= []
       arr.forEach(item=>{
        const parent = map[item.pid]
        if(parent){
             parent.children.push(item)
        }else{
            newarr.push(item)
        }
       })
       return newarr
        }
       
       console.log(newarr);

    </script>
   
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